Ray Gun in "Little Resistance" mission:
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After the boat crashes, call in an air strike on the specified location. Run up
to the beach, and move to the right. You will find a small puddle at the right
side of the beach. Stand in it briefly, then move towards the middle of the
beach to find a smaller puddle. Stand in that puddle briefly. Move towards the
far left side of the beach. Stand briefly in the puddle in the barb wire. After
several seconds, the screen will shake, and you will hear strange voices. Four
lion statues will rise out of the ground with alien Ray Guns in their mouths.

Extra ammunition:
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Use the following trick if run out or are running low on ammunition on any
mission in Solo mode on any difficulty. Find a non-essential teammate (someone
not involved in the story line). Walk up to him, and aim the reticule next to
his head or torso. Knife the air, and as you do so move slightly towards them so
that the reticule is over them. If done correctly, he should die and drop his
weapon. Non-essential teammates will get replaced when you walk into a battle.
If the teammate does not die but keeps getting back up, they are essential to
the story (for example, Sgt. Roebuck and Sgt. Rezenov).

Hidden radio music in Nacht Der Untoten:
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Start any type of Nazi Zombie game, and unlock the door to the Mystery Box room.
Go to the Mystery Box. Go over to the right, and look at a table to find a
radio. Shoot a bullet at the radio. After a few seconds, you will hear random
types of music such as rock, disco, opera, and some in-game music such as the
Russian victory song, the final mission music, or the Japanese combat music. The
music will stop in between rounds but will then start again. Every player in
game should hear it.

Easy "Gunslinger" trophy:
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After you get to the sniper spot to kill General Amsel, shoot all your pistol
ammunition. Then, switch to your sniper rifle, then switch back to your pistol.
You should now have 80 rounds of ammunition instead of only 13.

Easy "Rough Economy" trophy:
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Play the "Vendetta" mission. After you shoot General Amsel's guards and move up
to the car with the sergeant, a group of Nazis will appear down the street. Do
not follow the sergeant. Instead, stay near the car, and wait for three of the
Nazis to get in a line, then shoot.

Ok, Run to the church (not inside it though!)...there should be a house with half of
its roof missing go up the stairs, goto a viewable place that u can see the church,
jump on the ledge ( no window bit) and jump on the corner, then press O to duck and
walk up it then when you suddenly stop press X and you should start to fly!
Make sure its the right building!